<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>hello_react</title>
</head>
<body>
    <div id="test1"></div>

    <!-- 引入 react 核心库 -->
    <script src="./js/react.development.js" type="text/javascript"></script> <!-- React 对象 -->
    <script src="./js/react-dom.development.js" type="text/javascript"></script> <!-- ReactDOM 对象 -->
    <script src="./js/babel.min.js" type="text/javascript"></script> <!-- babel -->
    <script src="./js/prop-types.js" type="text/javascript"></script> <!-- PropTypes -->

    <script type="text/babel">
        class Login extends React.Component {
            state = {
                username: '',
                password: ''
            }
            saveFormData = (dataType, event) => {
                this.setState({
                    [dataType] : event.target.value
                })
            }
            handleSubmit = (event) =>  {
                event.preventDefault()
                const {username, password} = this.state
                alert(`你输入的用户名是:${username}，密码:${password}`)
            }
            render() {
                return (
                    <form onSubmit={this.handleSubmit}>
                        用户名: <input type="text" onChange={event => this.saveFormData('username', event)} name="username"/>
                        密码: <input type="password" onChange={event => this.saveFormData('password', event)} name="password"/>
                        <button>登录</button>
                    </form>
                )
            }
        }
        ReactDOM.render(<Login/>, document.querySelector('#test1'))
    </script>
</body>
</html>